My version is in poor MDF, bottom in plywood and doesn’t have screws or nails. Miters and bottom are simply glued (not the top, to make it easy to clean if necessary)Works great and it’s very useful for me. Thanks LDL !!!!

Thank you all for welcoming my first posted project and for making it to the Daily Top 3! This community rocksssssss :)All credits must go to LDL http://lumberjocks.com/ldlLew and Smitty, the size is fine and the slopes help to keep the suction more uniform.Don, the box bottom is actually flat and covered. The suction is restricted to the top surface. When sanding smaller pieces we can simply lay a piece of paper over some uncovered holes, to concentrate the suction on a smaller area.Works great and it’s fun to build.Thank you again for the welcome.CheersDado